She was said to be hiding with her husband and daughter-in-law, who were also detained and are being interrogated, in the the northern Syrian town of Azaz, Reuters reports.
Interestingly the 65-year old woman, Rasmiya Awad, accompanied also by five children, turned up in a Turkish-controlled area near the border. "We hope to gather a trove of intelligence from Baghdadi's sister on the inner workings of ISIS," a top Turkish official said.
Despite the slain ISIS leader's sister turning up right under the nose of Turkish forces, Ankara touted it as "evidence of Turkey's determination to fight against Islamic State," according to President Erdogan's spokesman.
"The arrest of al-Baghdadi's sister is yet another example of the success of our counter-terrorism operations," spokesman Fahrettin Altun stated on Tuesday. "Much dark propaganda against Turkey has been circulating to raise doubts about our resolve against Daesh," he wrote, and added, "Our strong counter-terrorism cooperation with like-minded partners can never be questioned."